Question

我正在为I2C通信开发attiny85。我已经遍历了像Wire.h，TinyWire.h，tinyWireM.h，tinyWireS.h这样的不同库。

首先，我想通过I2C通讯发送一些字节的数据，并试图用示波器确定引脚的范围，但它没有给我适当的结果。在互联网上寻找使attiny85与I2c配合使用的不同方法实在是无情的，我无法完成任务。最终，我尝试将attiny85用作主机，将arduino Uno用作从机，因为它在我的包装盒中是备用的。

我试图以attiny85作为主机，并将数据发送到arduino，并在串行监视器上查看输出，但显示为零。

作为参考，附加了主代码和从代码，我的任务很容易检查串行。

Attiny85作为管理员

#include <TinyWireM.h>

void setup()
{
  TinyWireM.begin();
}
void loop()
{
  TinyWireM.begin();
  TinyWireM.beginTransmission(0x08);
  TinyWireM.send(0x99);  
  int Byte1 = TinyWireM.endTransmission();
  delay(1000);
}

Arduino作为奴隶

#include <Wire.h>
const byte add = 0x08;
int byte1;
void setup()
{
  Wire.begin(add);               
  Wire.onReceive(receiveEvent); 
  Serial.begin(9600);         
}

void loop()
{
  Serial.println ("Data receiving");
  Serial.println(byte1);
  delay(1000);
}

void receiveEvent(int bytes)
{
  byte1 = Wire.read(); 
}

但是我无法在arduino的串行监视器上获得输出。我在这里做什么错了？

Answer 1

一段时间以前，我已经使用TinyWireS lib（https://github.com/nadavmatalon/TinyWireS）将Atiny85用作从属设备，并且工作正常。下面是引脚配置

ATtiny85引脚5与Arduino Uno A4和带有Arduino Uno A5的ATtiny85引脚7

下面是我的代码

Atiny。

#include "TinyWireS.h"                      

 const byte SLAVE_ADDR = 100;
 const byte NUM_BYTES = 4;

 volatile byte data = { 0, 1, 2, 3 };

 void setup() {
    TinyWireS.begin(SLAVE_ADDR);
    TinyWireS.onRequest(requestISR);
}

 void loop() {}

 void requestISR() {
    for (byte i=0; i<NUM_BYTES; i++) {
        TinyWireS.write(data[i]);
        data[i] += 1;
    }
}

Uno。

#include <Wire.h>

 const byte SLAVE_ADDR = 100;

 const byte NUM_BYTES = 4;

 byte data[NUM_BYTES] = { 0 };

 byte bytesReceived = 0;

 unsigned long timeNow = millis();

 void setup() {
    Serial.begin(9600);
    Wire.begin();
    Serial.print(F("\n\nSerial is Open\n\n"));
}

 void loop() {
    if (millis() - timeNow >= 750) {                                        // trigger every 750mS
        Wire.requestFrom(SLAVE_ADDR, NUM_BYTES);                            // request bytes from slave
        bytesReceived = Wire.available();                                   // count how many bytes received
        if (bytesReceived == NUM_BYTES) {                                   // if received correct number of bytes...
            for (byte i=0; i<NUM_BYTES; i++) data[i] = Wire.read();         // read and store each byte
            printData();                                                    // print the received data
        } else {                                                            // if received wrong number of bytes...
            Serial.print(F("\nRequested "));                                // print message with how many bytes received
            Serial.print(NUM_BYTES);
            Serial.print(F(" bytes, but got "));
            Serial.print(bytesReceived);
            Serial.print(F(" bytes\n"));
        }
        timeNow = millis();                                                 // mark preset time for next trigger
    }
}

 void printData() {
    Serial.print(F("\n"));
    for (byte i=0; i<NUM_BYTES; i++) {
          Serial.print(F("Byte["));
          Serial.print(i);
          Serial.print(F("]: "));
          Serial.print(data[i]);
          Serial.print(F("\t"));
    }
    Serial.print(F("\n"));    
}

带有ArduinoUno的Attiny85 for I2c comm

1 个答案: